US11456629B2 - Stator with divided cores connected circumferentially - Google Patents

Stator with divided cores connected circumferentially Download PDF

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Publication number
US11456629B2
US11456629B2 US16/769,583 US201816769583A US11456629B2 US 11456629 B2 US11456629 B2 US 11456629B2 US 201816769583 A US201816769583 A US 201816769583A US 11456629 B2 US11456629 B2 US 11456629B2
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Prior art keywords
inner circumferential
protrusion
outer circumferential
bonding surface
notch
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US20210119498A1 (en
Inventor
Yoshinari Sato
Yoshimu TANIMOTO
Kaoru KOGA
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Kyocera Industrial Tools Corp
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Kyocera Industrial Tools Corp
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Assigned to KYOCERA INDUSTRIAL TOOLS CORPORATION reassignment KYOCERA INDUSTRIAL TOOLS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOGA, Kaoru, SATO, YOSHINARI, TANIMOTO, YOSHIMU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present invention relates to a stator core formed by disposing a plurality of divided cores including yoke parts and teeth parts in an annular shape, and a method for manufacturing the stator core.
  • Patent Document 1 is, in essence, a technique in which in a stator core configured by disposing a plurality of divided cores each including a yoke part extending in a circumferential direction and a teeth part protruding in a central direction from a central portion of the yoke part, in an annular shape, a pair of adjacent divided cores of the plurality of divided cores each include a bonding surface provided on each the yoke part and bonded to each other, and when the pair of adjacent divided cores are assembled, one of the two bonding surfaces that are bonded so as to face each other has a concave shape, and another has a convex shape, and thus the concave shape and the convex shape are combined and bonded.
  • Patent Document 1 has been made for the purpose of providing a stator core capable of, at a level that a magnetic path is not affected, securing a region as wide as possible on which a winding wire can be actually wound, and increasing an amount of winding, thereby improving motor performance.
  • Patent Document 1 JP 2013-208021 A
  • Patent Document 2 JP 4907654 B
  • the present invention has been made in view of the problems present in the related art described above, and an object thereof is, in a stator core formed by disposing and assembling a plurality of divided cores in an annular shape, to achieve a stator core that, while being easily manufacturable, can obtain high strength, and a method for manufacturing the stator core.
  • a stator core is a stator core configured by assembling a plurality of divided cores in an annular shape, each of the plurality of divided cores includes a yoke part extending in a circumferential direction, each the yoke part includes a first facing section and a second facing section each facing a yoke part of another adjacent divided core, the first facing section includes an inner circumferential protrusion formed on an inner circumferential side, an outer circumferential protrusion formed on an outer circumferential side, and a central recess formed between the inner circumferential protrusion and the outer circumferential protrusion, the second facing section includes an inner circumferential notch formed on the inner circumferential side, an outer circumferential notch formed on the outer circumferential side, and a central protrusion formed between the inner circumferential notch and the outer circumferential notch, in a state in which the plurality of divided cores are assembled, the inner circumferential protrusion faces the inner circumferential notch,
  • stator core In the stator core according to the present invention, a configuration can be adopted in which, in a state in which the plurality of divided cores are assembled, the inner circumferential protrusion and the inner circumferential notch contact each other at each of the first facing section and the second facing section included in the plurality of divided cores, and at least some of positions other than the inner circumferential protrusion and the inner circumferential notch do not contact each other.
  • a contact part that the inner circumferential protrusion and the inner circumferential notch contact may be constituted by a flat surface.
  • the outer circumferential protrusion may include a first end portion having a first width in a direction orthogonal to the circumference direction, and a second end portion formed so as to have a width larger than that of the first end portion.
  • a sloped part inclined diagonally with respect to the circumference direction may be formed in a portion of the outer circumferential protrusion, and a portion of the central protrusion that faces the sloped part may be formed diagonally.
  • a method for manufacturing a stator core according to the present invention is a method for manufacturing a stator core configured by assembling a plurality of divided cores in an annular shape, each of the plurality of divided cores includes a yoke part extending in a circumferential direction, each the yoke part includes a first facing section and a second facing section each facing a yoke part of another adjacent divided core, the first facing section includes an inner circumferential protrusion formed on an inner circumferential side, an outer circumferential protrusion formed on an outer circumferential side, and a central recess formed between the inner circumferential protrusion and the outer circumferential protrusion, the second facing section includes an inner circumferential notch formed on the inner circumferential side, an outer circumferential notch formed on the outer circumferential side, and a central protrusion formed between the inner circumferential notch and the outer circumferential notch, the plurality of divided cores are assembled such that the inner circumferential protrusion faces the inner
  • a stator core formed by disposing and assembling a plurality of divided cores in an annular shape it is possible to achieve a stator core that can, while being easily manufacturable, obtain high strength, and a method for manufacturing the stator core.
  • FIGS. 1A and 1B are diagrams for explaining a basic configuration and a method for manufacturing the stator core according to the present embodiment
  • FIG. 1A illustrates a state before assembly of the stator core in which a plurality of divided cores are disposed in an annular shape
  • FIG. 1B illustrates a state in which the plurality of divided cores disposed in the annular shape are assembled.
  • FIG. 2 is an exterior perspective view illustrating an overall configuration of the divided core.
  • FIG. 3 is a plan view for explaining a shape of the divided core according to the present embodiment.
  • FIG. 4 is an enlarged view of a position indicated by a reference sign A in FIG. 3 .
  • FIG. 5 is an enlarged view of a position indicated by a reference sign B in FIG. 3 .
  • FIG. 6 is a plan view of the stator core formed by assembling six number of the divided cores.
  • FIG. 7 is a main portion enlarged view in which a main portion of the stator core illustrated in FIG. 6 is enlarged.
  • FIG. 8 is a diagram for explaining formal characteristics and effects inherent in an inner circumferential protrusion and an inner circumferential notch as a wedge shape formed in a first facing section and a second facing section respectively, that are bonding surfaces of the divided core according to the present embodiment.
  • FIGS. 1A and 1B are diagrams for explaining the basic configuration and the manufacturing method of the stator core according to the present embodiment
  • FIG. 1A illustrates a state before assembly of the stator core in which a plurality of divided cores are disposed in an annular shape
  • FIG. 1B illustrates a state in which the plurality of divided cores disposed in the annular shape are assembled.
  • FIGS. 1A and 1B are diagrams each illustrating a state in which the plurality of divided cores are disposed on a plane orthogonal to a rotor axis (not illustrated).
  • FIG. 2 is an exterior perspective view illustrating an overall configuration of the divided core.
  • a stator core 100 is a member formed by assembling six divided cores 10 .
  • each of the divided cores 10 is formed by preparing a thin sheet member 11 having a planar shape of the divided core 10 by punching a silicon sheet or the like in a pressing process or the like, piling up and laminating the thin sheet members 11 , and integrally bonding the thin sheet members 11 by laser welding or the like.
  • the divided core 10 manufactured in this manner in a case viewing in a positional relationship when assembled into the stator core 100 , is configured by including a yoke part 10 a extending in a circumferential direction, and a teeth part 10 b protruding in a central direction from a central portion of the yoke part 10 a.
  • the divided core 10 In the divided core 10 , from a state illustrated in FIG. 2 , a coil (not illustrated) is wounded around the teeth part 10 b . Then, the divided cores 10 each wound with the coil (not illustrated) are disposed in the annular shape, as illustrated in FIG. 1A .
  • the six divided cores 10 disposed in the annular shape are formed in a shape of the stator core 100 as illustrated in FIG. 1B , by simultaneously bringing close the six divided cores 10 in a central direction of the rotor axis (that is, an arrow direction illustrated in FIG. 1A ) on a plane orthogonal to the rotor axis (not illustrated).
  • the six divided cores 10 are integrally bonded to each other by laser welding or the like to complete the stator core 100 according to the present embodiment.
  • the process of simultaneously bringing close the six divided cores 10 and integrally bonding each other by laser welding or the like may be performed automatically by manufacturing equipment such as an assembly machine, an assembly robot, or the like.
  • FIG. 3 is a plan view for explaining a shape of the divided core according to the present embodiment.
  • FIG. 4 is an enlarged view of a position indicated by the reference sign A in FIG. 3
  • FIG. 5 is an enlarged view of a position indicated by the reference sign B in FIG. 3 .
  • FIG. 6 is a plan view of the stator core formed by assembling the six divided cores
  • FIG. 7 is a main portion enlarged view in which a main portion of the stator core illustrated in FIG. 6 is enlarged.
  • both end portions of the yoke part 10 a of the divided core 10 according to the present embodiment are configured as two bonding surfaces such that each the end portion can be bonded to an end portion of the yoke parts 10 a of the divided core 10 being adjacent. Furthermore, these two bonding surfaces are configured as a first facing section A and a second facing section B according to the present invention, respectively.
  • the second facing section B that is an end portion of the yoke part 10 a on a right side of a paper surface, and the first facing section A that is an end portion on a left side of the paper surface have different shapes from each other respectively, and are configured as bonding surfaces in each of which both the end portions have respective shapes that enable bonding of the second facing section B that is the end portion of the yoke part 10 a on the right side of the paper surface, and the first facing section A that is the end portion of the yoke part 10 a on the left side of the paper surface to each other (see FIG. 7 and the like).
  • the divided core 10 when a pair of the divided cores 10 being adjacent to each other are assembled, the divided core 10 according to the present embodiment is configured to have a convex and concave shape formed in a direction orthogonal to a bisector ( 3 , for the two bonding surfaces (first facing section A and second facing section B) that are bonded so as to face each other, in a case the bisector ⁇ of an angle formed by respective center lines a of the teeth parts 10 b of the pair of divided cores 10 is assumed.
  • a bisector 3
  • the bonding surface is formed as a concave shape in the end portion (first facing section A) of the yoke part 10 a of the divided core 10 disposed on the right side of the paper surface, and the bonding surface is formed as a convex shape in the end portion (second facing section B) of the yoke part 10 a of the divided core 10 disposed on the left side of the paper surface.
  • the concave shape formed in the end portion (first facing section A) of the yoke part 10 a of the divided core 10 disposed on the right side of the paper surface in FIG. 7 is configured by including an inner circumferential protrusion 76 formed on an inner circumferential side of the first facing section A that is the bonding surface, an outer circumferential protrusion 74 formed on an outer circumferential side of the bonding surface, and a central recess 72 formed between the inner circumferential protrusion 76 and the outer circumferential protrusion 74 .
  • the central recess 72 included in the concave shape of the first facing section A and the central protrusion 71 included in the convex shape of the second facing section B are formed to have respective outer contours that enable mutual assembly.
  • the concave shape and the convex shape that constitute the first facing section A and the second facing section B respectively that are the two bonding surfaces disposed so as to face each other, are assembled and bonded to each other so as to bond the divided cores 10 to each other.
  • the convex and concave shape configured by combining the convex shape and the concave shape is configured so as to protrude or be recessed in the direction orthogonal to the bisector ⁇ . More specifically, as illustrated in FIG. 7 , the central protrusion 71 forming the convex shape of the divided core 10 disposed on the left side of the paper surface is configured to protrude in the direction orthogonal to the bisector ⁇ . Further, the central recess 72 forming the concave shape of the divided core 10 disposed on the right side of the paper surface in FIG. 7 is configured to be recessed in the direction orthogonal to the bisector ⁇ . Such a configuration achieves reliable bonding of the two bonding surfaces to be bonded so as to face each other without friction when the six divided cores 10 are brought close simultaneously.
  • the divided core 10 when the adjacent pair of the divided cores 10 are assembled, is configured to further have a planar shape formed in a direction parallel to the bisector ⁇ , for each of the two bonding surfaces (first facing section A and second facing section B) that are bonded so as to face each other.
  • the outer circumferential notch 73 and the outer circumferential protrusion 74 disposed on the outer circumferential side of the bonding surface are formed as planar shapes in the direction parallel to the bisector ⁇ . Also, in the example illustrated in FIG.
  • a part of surface on the inner circumferential side of each of the central protrusion 71 and the central recess 72 disposed on a central side of the bonding surface is formed as a planar shape in the direction parallel to the bisector ⁇ . Furthermore, in the example illustrated in FIG. 7 , each of a notch surface of the inner circumferential notch 75 and a tip surface of the inner circumferential protrusion 76 disposed on the inner circumferential side of the bonding surface is formed as a planar shape in the direction parallel to the bisector ⁇ . Since the divided core 10 according to the present embodiment has the planar shape described above, it is possible to reliably make the divided cores 10 that are easily combined and adjacent to each other contact each other.
  • the divided core 10 when the adjacent pair of the divided cores 10 are assembled, is configured such that, for the two bonding surfaces (first facing section A and second facing section B) that are bonded so as to face each other, the inner circumferential protrusion 76 and the inner circumferential notch 75 that are respective contact parts on the inner circumferential side of the bonding surface have a wedge shape.
  • first facing section A and second facing section B the two bonding surfaces that are bonded so as to face each other.
  • the wedge shape is formed on the inner circumferential side of each of the first facing section A and the second facing section B being the bonding surfaces, and as a site that forms this wedge shape, the inner circumferential notch 75 is formed as a wedge concave shape portion in the second facing section B that is the end portion of the yoke part 10 a of the divided core 10 disposed on the left side of the paper surface, or the inner circumferential protrusion 76 is formed as a wedge convex shape portion in the first facing section A that is the end portion of the yoke part 10 a of the divided core 10 disposed on the right side of the paper surface.
  • the bonding surfaces first facing section A and second facing section B
  • the bonding surfaces each formed in the end portion of the yoke part 10 a during a bonding operation do not frictionally contact each other, and only the inner circumferential notch 75 and the inner circumferential protrusion 76 that constitute the wedge shape contact each other just before completion of the bonding.
  • the two bonding surfaces (first facing section A and second facing section B) that are bonded so as to face each other are configured such that positions other than the inner circumferential notch 75 and the inner circumferential protrusion 76 that are the respective contact parts configured in the wedge shape are each adjacent to a gap, so the bonding surfaces each formed in the end portion of the yoke part 10 a will not be mutually rubbed.
  • a configuration is obtained in which failure such as deformation is unlikely to occur, and assemblability is excellent.
  • the outer circumferential protrusion 74 that forms the concave shape is formed to have a larger thickness than that of the inner circumferential protrusion 76 that also forms the concave shape.
  • the outer circumferential protrusion 74 according to the present embodiment has a formal characteristic that a width in a direction orthogonal to a circumference direction is formed to be larger than that of the inner circumferential protrusion 76 . Adopting such a configuration is to improve strength of the stator core 100 , and specifically, as illustrated in FIG.
  • a sloped part 74 a that protrudes toward a side of the central recess 72 is formed in the outer circumferential protrusion 74 included in the concave shape, such that a thickness increases toward a base portion of a protruding portion that is a base end portion (see FIG. 7 ).
  • the outer circumferential protrusion 74 is configured to include a first end portion having a first width in the direction orthogonal to the circumference direction and a second end portion formed to have a width larger than that of the first end portion, and a configuration is adopted in which the first end portion forms a distal end side of the outer circumferential protrusion 74 , and the second end portion forms the base portion of the protruding portion that is the base end portion.
  • the presence of the sloped part 74 a inclined diagonally with respect to the circumference direction is preferable because strength can be improved, for example, compared to a case where the outer circumferential protrusion 74 is formed with a simple rectangular shape, such as a dashed line indicated by a reference sign 74 b in FIG. 7 .
  • a sloped cutout shape corresponding to the sloped part 74 a is adopted.
  • the stator core 100 according to the present embodiment is constituted as a stator core having improved strength.
  • FIG. 8 is a diagram for explaining formal characteristics and effects inherent in the inner circumferential protrusion and the inner circumferential notch as the wedge shape formed in the first facing section and the second facing section respectively, that are each the bonding surface of the divided core according to the present embodiment. As illustrated in FIG.
  • the first facing section A and the second facing section B that are the two bonding surfaces that are to be bonded so as to face each other, are welded to each other defining a position indicated by a reference sign (a) on the outer circumferential side as a welding point.
  • a line segment forming a bonding surface in a wedge shape that the inner circumferential notch 75 and the inner circumferential protrusion 76 contact is referred to as a wedge-shaped bonding surface (b), and an arbitrary point (c) is set on the line segment of the wedge-shaped bonding surface (b).
  • the welding point (a) is defined as a central point, a virtual arc having a radius that is a virtual line that connects the welding point (a) and the point (c) set on the line segment of the wedge-shaped bonding surface (b) is set, and a tangential component of the virtual arc drawn on the point (c) is set as a tangent line (d).
  • the wedge-shaped bonding surface (b) and the tangent line (d) are configured to form an angle ⁇ , thus it is possible to obtain a propping effect on force in a direction indicated by a reference sign (e) with the welding point (a) as the central point.
  • the gaps formed at positions other than the inner circumferential notch 75 and the inner circumferential protrusion 76 that are the contact parts configured in the wedge shape are preferably configured to have a uniform dimension. Furthermore, when the gap dimension is too large, an action of inhibiting a magnetic flux flow works, on the other hand, when the gap dimension is too small, positions other than the wedge shape contact each other during assembly, thereby inhibiting assemblability. Thus, it is preferable to set the gap dimensions with dimensional accuracy that satisfies the above-described two conditions that a magnetic flux flow is not inhibited and assemblability is not inhibited.
  • the stator core 100 according to the present embodiment formed by assembling the divided cores 10 having the various formal characteristics described above is configured as an unprecedent stator core that, while being easily manufacturable, can obtain high strength.
  • the first facing section A and the second facing section B that are the two bonding surfaces that are bonded so as to face each other are configured such that each of the inner circumferential notch 75 and the inner circumferential protrusion 76 that are the contact part on the inner circumferential side of the bonding surface has the wedge shape.
  • the location on which of the wedge shape is formed is not limited to the inner circumferential side of the bonding surface. In the present invention, it is also possible to form a wedge shape in a central portion of a bonding surface.
  • the gaps formed at positions other than the inner circumferential notch 75 and the inner circumferential protrusion 76 that are the contact parts configured in the wedge shape are configured to have a uniform dimension.
  • the gap dimensions need not be uniform at all sites, and may be formed such that, in order not to inhibit a magnetic flux flow flowing in the direction orthogonal to the bisector ⁇ illustrated in FIG.
  • a gap between the outer circumferential notch 73 and the outer circumferential protrusion 74 that are surfaces in a parallel direction to the bisector ⁇ , or a gap between a tip portion of the central protrusion 71 and a bottom surface portion of the central recess 72 is made as narrow as possible, and the other gap dimensions are formed so as to be slightly larger. Even when such a modified configuration is adopted, similar effects to those of the embodiment described above can be obtained.
  • stator core in addition to the method assumed in the embodiment described above, it is possible to adopt a manufacturing method in which the plurality of divided cores 10 are moved in the rotor axis direction and bonded to each other, and it is possible to apply the present invention to the stator core manufactured according to such a manufacturing method.
  • the stator core of the present invention has high strength while being easily manufacturable, and therefore has industrial applicability, for example, as a component of a rotating electrical machine such as a motor used in an electric tool.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
US16/769,583 2017-12-07 2018-11-28 Stator with divided cores connected circumferentially Active 2039-03-20 US11456629B2 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JPJP2017-234907 2017-12-07
JP2017234907 2017-12-07
JPJP2017-235136 2017-12-07
JP2017235136 2017-12-07
JP2017-235136 2017-12-07
JP2017-234907 2017-12-07
PCT/JP2018/043714 WO2019111777A1 (ja) 2017-12-07 2018-11-28 固定子鉄心、固定子鉄心の製造方法

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US20220209593A1 (en) * 2019-10-02 2022-06-30 Mitsubishi Electric Corporation Electric rotating machine
US20230048985A1 (en) * 2020-04-01 2023-02-16 Fanuc Corporation Stator, rotor, and rotating electrical machine

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Publication number Priority date Publication date Assignee Title
EP3780340A1 (en) 2019-08-14 2021-02-17 Siemens Gamesa Renewable Energy A/S Segmented stator for a generator, in particular for a wind turbine
KR20210042619A (ko) * 2019-10-10 2021-04-20 엘지이노텍 주식회사 모터
DE102021132720A1 (de) * 2021-09-24 2023-03-30 Hanning Elektro-Werke Gmbh & Co. Kg BLDC-Motor
CN114157055B (zh) * 2021-12-03 2022-12-30 广东美芝制冷设备有限公司 定子、电机、压缩机和制冷设备

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